Are these normal? 5V pin got only 4.76V and 3.3V pin got only 3.15V

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i working on mq-2 smoke detector module supply voltage 5v pin of arduino uno r3.
normally, mq-2 module use 115 - 130 ma.
my uno r3 use 40 ma while running loop.

usb cable only:
no load -> voltage coming out 5v pin is  4.86v.
no load -> voltage coming out 3.3v pin 3.28v.
mq-2 load -> voltage coming out 5v pin 4.76v.
mq-2 load -> voltage coming out 3.3v pin 2.81v.
the analog output mq-2 module high (~110).

external 9v power adaptor via dc jack:
no load -> voltage coming out 5v pin 4.98v.
no load -> voltage coming out 3.3v pin 3.30v.
mq-2 load -> voltage coming out 5v pin 4.78v.
mq-2 load -> voltage coming out 3.3v pin 2.88v.
the analog output mq-2 module high (~110).

use own 7805 regulator apply mq-2 module:
no load -> 5.02v
mq-2 load -> 5.02v.
the analog output mq-2 module low (~55).


hi - try power little off arduino can, , use 7805's power both arduino , attached sensors, displays etc. way know have plenty of power external components , known voltage throughout design.


Arduino Forum > Using Arduino > Microcontrollers > Are these normal? 5V pin got only 4.76V and 3.3V pin got only 3.15V


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